Radio Altimeter AD: 5G Cell Interference

But unless you fly a transport-category aircraft greater than 12,500 MTOW, the AD doesn't apply. Still, all rad alt users should be aware.

By
Larry Anglisano
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Published:
4G and 5G communication antennas at the top of the hill, near the inhabited centers. Wireless communication tower, in the background the blue sky.
You probably heard the buzz about 5G wireless broadband cell towers interfering with aircraft radar altimeter systems (also called radio altimeters). And now there are two FAA Airworthiness Directives (AD 2021-23-12 and 2021-23-13) in place. The latter is focused on helicopter operations. In part, the ADs say that radio altimeters are unreliable if they experience […]
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Larry Anglisano
Editor in Chief Larry Anglisano has been a staple at Aviation Consumer since 1995. An active land, sea and glider pilot, Larry has over 30 years’ experience as an avionics repairman and flight test pilot. He’s the editorial director overseeing sister publications Aviation Safety magazine, IFR magazine and is a regular contributor to KITPLANES magazine with his Avionics Bootcamp column.

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